CLHS: Section 3.1.1.3

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## 3.1.1.3 Lexical Environments

A lexical environment for evaluation at some position in a program is that part of the environment that contains information having lexical scope within the forms containing that position. A lexical environment contains, among other things, the following:

- bindings of lexical variables and symbol macros.
- bindings of functions and macros. (Implicit in this is information about those compiler macros that are locally disabled.)
- bindings of block tags.
- bindings of go tags.
- information about declarations.

The lexical environment that is active at any given position in a program being semantically processed is referred to by definite reference as ``the current lexical environment,'' or sometimes as just ``the lexical environment.''

Within a given namespace, a name is said to be bound in a lexical environment if there is a binding associated with its name in the lexical environment or, if not, there is a binding associated with its name in the global environment.

## 3.1.1.3.1 The Null Lexical Environment

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